1388915 has 8 divisors (see below), whose sum is σ = 1818288. Its totient is φ = 1010080.

The previous prime is 1388887. The next prime is 1388927. The reversal of 1388915 is 5198831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1388915 - 2⁸ = 1388659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12572 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (227286).

2^1388915 is an apocalyptic number.

1388915 is a deficient number, since it is larger than the sum of its proper divisors (429373).

1388915 is a wasteful number, since it uses less digits than its factorization.

1388915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25269.

The product of its digits is 8640, while the sum is 35.

The square root of 1388915 is about 1178.5223799318. The cubic root of 1388915 is about 111.5728575282.

It can be divided in two parts, 13889 and 15, that multiplied together give a triangular number (208335 = T₆₄₅).

The spelling of 1388915 in words is "one million, three hundred eighty-eight thousand, nine hundred fifteen".